• Prepare a 13 x 9 inch pan with cooking spray. Set aside. 
• Chop your bacon or ham into cubes and set aside. 
• Split the english muffins in half and cut into cubes. Set aside. 
• In a large skillet, over medium heat, saute canadian bacon pieces until lightly browned. If you are using ham you can skip this part. if you want to.  I still like to brown the chopped ham too!  Set aside on a paper towel lined plate.  
• Sprinkle half of the canadian bacon or ham across the bottom of your prepared dish.  Next, add all of the chopped english muffins and then top with remaining canadian bacon or ham. 
• In a large bowl combine eggs, milk, cream, salt, and pepper. Pour all over the top of the english muffins and canadian bacon or ham. Make sure that all of the english muffin pieces have been coated with the egg mixture. We use a fork to press each piece of english muffin down into the egg mixture. Cover and refrigerate overnight. 

The next day

• Preheat your oven to 350 degrees. 
• Remove casserole from refrigerator and allow it to stay on your counter while your oven heats up. Bake, covered with foil, for 45 minutes. 
• Uncover and bake for another 15 minutes or until a toothpick inserted near the center comes out clean. If your casserole starts to over brown in the last 15 minutes cover your casserole again, loosely with tinfoil. 
• While your casserole is baking, prepare the hollandaise sauce. In top of a double boiler or in a heavy bottomed saucepan (over medium-low heat) melt your butter. Add heavy cream. Then add egg yolks, lemon juice, hot sauce and mustard until blended. Continue to cook, whisking constantly, until mixture has thickened. Watch that the bowl does not get too hot. Do not let the sauce vigorously boil. You can take the pot on and off the double boiler, or element, as needed. Be sure to taste your hollandaise sauce.  My son always adds more hot sauce and my husband always adds extra mustard when he makes it.  The decision is up to you!  
• When the hollandaise sauce is to your liking drizzle it all over your casserole, right before serving.  Garnish with chopped dill or green onions, if desired. Serve immediately. Enjoy every bite!